Always use citations when:
For more tips, see this guide from Duke University Libraries.
The CRAAP Test is a list of questions (developed at Meriam Library at California State University, Chico) to help you analyze the validity of a source. Here is a short list of things to look for to see if your information source passes the CRAAP test:
Here's the original:
This video shows you how to find citation information in the GIL-Find catalog and in several research databases, including citation formatting tools. It demonstrates how to translate that information into a citation.